Schistostega D. Mohr, 1803.

Schistostega occupies humid forests in Oregon and northward. It is unique among Northern Hemisphere mosses in having a protonema that appears to fluoresce in the intensely shaded recesses to which it is restricted. Close examination for such fluorescence in recesses in trail banks or under root wads may reveal its presence in northern California. Schistostega is one of our strictly distichous mosses but it differs from the others in that the basal (postical) margin of each leaf fuses with the antical margin of the next leaf below to produce a leafy stem similar to the pinnatifid leaf of some ferns.
see key to Fissidens Etc.